import React, { Component } from "react";
import { withRouter } from "react-router-dom";

class Header extends Component {

    back = () =>{
        this.props.history.goBack()
      }
    
      forward = () =>{
        this.props.history.goForward()
      }

  render() {
    return (
      <div>
        <h2>React Router Demo</h2>
        <button onClick={this.back}>回退</button>
        &nbsp;
        <button onClick={this.forward}>前进</button>
      </div>
    );
  }
}

export default withRouter(Header);
